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Science MCQ (1 Marks)

Changes Around Us: Physical and Chemical · Gujarat Board (GSEB) STD 7 (GSEB - English Medium). 37 questions.

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MCQ (1 Marks)

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37 questions · timed · auto-graded

MCQ 11 Mark
Which of the following statements are the characteristics of a physical change?
(i) The state of the substance may or may not change.
(ii) A substance with different properties is formed.
(iii) No new substance is formed.
(iv) The substance undergoes a chemical reaction.
  • A
    (i) and (ii)
  • B
    (ii) and (iii)
  • ✓
    (i) and (iii)
  • D
    (iii) and (iv)
Answer
Correct option: C.
(i) and (iii)
(C) (i) and (iii)
(i) The state of the substance may or may not change – Physical changes can involve changes in state (like melting or freezing) but no new substance is formed.
(iii) No new substance is formed – In a physical change, the substance remains the same, only its form or state changes.
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MCQ 21 Mark
What is ignition temperature?
  • ✓
    The minimum temperature at which a substance catches fire.
  • B
    The maximum temperature at which a substance catches fire.
  • C
    Any temperature at which a substance catches fire.
  • D
    None of these.
Answer
Correct option: A.
The minimum temperature at which a substance catches fire.
A
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MCQ 31 Mark
Which of the following is/are true when milk changes into curd?
(i) Its state is changed from liquid to semi solid.
(ii) It changes colour.
(iii) It changes taste.
(iv) The change cannot be reversed.
Choose the correct option from below:
  • A
    (i) and (ii) are correct
  • B
    (ii) and (iii) are correct
  • ✓
    (i), (iii) and (iv) are correct
  • D
    (i) to (iv) are correct
Answer
Correct option: C.
(i), (iii) and (iv) are correct
C
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MCQ 41 Mark
Which of the following is a chemical change?
  • A
    Burning of paper
  • B
    Reaction of vinegar with baking soda
  • C
    Addition of carbon dioxide to lime water
  • ✓
    All of these
Answer
Correct option: D.
All of these
D
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MCQ 51 Mark
In which type of change a new substance is formed?
  • A
    Physical change
  • ✓
    Chemical change
  • C
    Both of these
  • D
    None of these
Answer
Correct option: B.
Chemical change
B
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MCQ 61 Mark
Which of the following is a physical change?
  • A
    Rusting of iron
  • B
    Combustion of magnesium ribbon
  • C
    Burning of candle
  • ✓
    Melting of wax
Answer
Correct option: D.
Melting of wax
D
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MCQ 71 Mark
Formation of manure from leaves is a
  • A
    physical change
  • ✓
    chemical change
  • C
    both physical and chemical change
  • D
    none of these
Answer
Correct option: B.
chemical change
B
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MCQ 81 Mark
Which of the following is rust?
  • A
    lime water
  • ✓
    iron oxide
  • C
    vinegar
  • D
    baking soda
Answer
Correct option: B.
iron oxide
B
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MCQ 91 Mark
The substances which have very low ignition temperature will
  • ✓
    catch fire easily
  • B
    will not catch fire
  • C
    catch fire after some time
  • D
    none of these.
Answer
Correct option: A.
catch fire easily
A
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MCQ 101 Mark
What happens when a candle is burnt?
  • A
    Only physical change occurs
  • B
    Only chemical change occurs
  • ✓
    Both physical and chemical changes occur
  • D
    No change occurs
Answer
Correct option: C.
Both physical and chemical changes occur
C
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MCQ 111 Mark
When water is boiled, it changes from:
  • ✓
    Liquid to gas
  • B
    Solid to gas
  • C
    Gas to liquid
  • D
    Solid to liquid
Answer
Correct option: A.
Liquid to gas
A
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MCQ 121 Mark
Which of these does not involve a chemical reaction?
  • A
    Burning of magnesium
  • ✓
    Dissolving salt in water
  • C
    Digestion of food
  • D
    Ripening of fruits
Answer
Correct option: B.
Dissolving salt in water
B
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MCQ 131 Mark
Which of the following is a characteristic of a chemical change?
  • A
    No new substance is formed
  • B
    The substance can be recovered
  • ✓
    A new substance is formed
  • D
    There is no change in the substance
Answer
Correct option: C.
A new substance is formed
C
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MCQ 141 Mark
The process of rusting is an example of a:
  • A
    Physical change
  • ✓
    Chemical change
  • C
    Both physical and chemical change
  • D
    None of these
Answer
Correct option: B.
Chemical change
B
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MCQ 151 Mark
What happens when you mix lemon juice and baking soda?
  • A
    A physical change
  • ✓
    A chemical change
  • C
    No change
  • D
    Both physical and chemical changes
Answer
Correct option: B.
A chemical change
B
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MCQ 161 Mark
What is formed when carbon dioxide is passed through lime water?
  • A
    Oxygen
  • ✓
    Calcium carbonate
  • C
    Water
  • D
    Calcium oxide
Answer
Correct option: B.
Calcium carbonate
B
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MCQ 171 Mark
Which of the following statements is true for a physical change?
  • A
    A new substance is formed
  • ✓
    The substance retains its original properties
  • C
    Heat is always produced
  • D
    A chemical reaction occurs
Answer
Correct option: B.
The substance retains its original properties
B
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MCQ 181 Mark
The process of turning water into steam is:
  • ✓
    A physical change
  • B
    A chemical change
  • C
    Irreversible
  • D
    Not a change
Answer
Correct option: A.
A physical change
A
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MCQ 191 Mark
When you blow air into lime water, it turns milky. What does this indicate?
  • A
    The presence of oxygen
  • ✓
    The presence of carbon dioxide
  • C
    A physical change
  • D
    The presence of hydrogen
Answer
Correct option: B.
The presence of carbon dioxide
B
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MCQ 201 Mark
Which of the following produces a new substance?
  • A
    Tearing paper
  • B
    Boiling water
  • ✓
    Mixing vinegar and baking soda
  • D
    Cutting a fruit
Answer
Correct option: C.
Mixing vinegar and baking soda
C
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MCQ 211 Mark
Which of these changes can be reversed?
  • A
    Burning of wood
  • ✓
    Melting of wax
  • C
    Rusting of iron
  • D
    Cooking of food
Answer
Correct option: B.
Melting of wax
B
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MCQ 221 Mark
Which of the following is a chemical change?
  • A
    Freezing of water
  • B
    Boiling of water
  • ✓
    Baking of bread
  • D
    Chopping vegetables
Answer
Correct option: C.
Baking of bread
C
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MCQ 231 Mark
Which of the following is a physical change?
  • A
    Rusting of iron
  • B
    Burning of magnesium
  • ✓
    Melting of ice
  • D
    Baking of a cake
Answer
Correct option: C.
Melting of ice
C
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MCQ 241 Mark
What type of change occurs when a piece of metal is heated and it becomes red hot?
  • A
    Chemical change
  • ✓
    Physical change
  • C
    Both physical and chemical change
  • D
    No change
Answer
Correct option: B.
Physical change
B
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MCQ 251 Mark
Which of the following reactions can be classified as an exothermic chemical change?
  • A
    Freezing of water
  • ✓
    Burning of fuel
  • C
    Dissolving sugar in water
  • D
    Boiling of water
Answer
Correct option: B.
Burning of fuel
B
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MCQ 261 Mark
Which of the following is an example of a chemical change occurring in nature?
  • ✓
    Ripening of fruits
  • B
    Freezing of water
  • C
    Dissolving sugar in tea
  • D
    Boiling of milk
Answer
Correct option: A.
Ripening of fruits
A
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MCQ 271 Mark
Which of the following indicates a physical change during the boiling of water?
  • ✓
    Formation of steam
  • B
    Chemical composition of water changes
  • C
    New substance is formed
  • D
    Energy is absorbed
Answer
Correct option: A.
Formation of steam
A
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MCQ 281 Mark
When a piece of wood is burned, which of the following occurs?
  • A
    Only physical change occurs
  • B
    Only chemical change occurs
  • ✓
    Both physical and chemical changes occur
  • D
    No change occurs
Answer
Correct option: C.
Both physical and chemical changes occur
C
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MCQ 291 Mark
Which of the following statements is correct regarding a chemical reaction?
  • A
    It involves the change of only physical properties.
  • B
    No new substances are formed during the reaction.
  • C
    Energy is always absorbed and no energy is released.
  • ✓
    New substances with different properties are formed.
Answer
Correct option: D.
New substances with different properties are formed.
D
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MCQ 301 Mark
During the combustion of magnesium, which of the following products is formed?
  • ✓
    Magnesium oxide
  • B
    Magnesium hydroxide
  • C
    Magnesium sulphide
  • D
    Magnesium carbonate
Answer
Correct option: A.
Magnesium oxide
A
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MCQ 311 Mark
Which of the following is an example of a reversible physical change?
  • A
    Boiling of water
  • B
    Burning of paper
  • ✓
    Melting of wax
  • D
    Ripening of fruit
Answer
Correct option: C.
Melting of wax
C
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MCQ 321 Mark
When vinegar is mixed with baking soda, the reaction produces a gas. What type of change is this?
  • A
    Physical change
  • ✓
    Chemical change
  • C
    Both physical and chemical changes
  • D
    None of these
Answer
Correct option: B.
Chemical change
B
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MCQ 331 Mark
What would happen if you pass carbon dioxide through freshly prepared lime water?
  • A
    It will turn lime water blue.
  • ✓
    It will turn lime water milky and a white precipitate will form.
  • C
    It will remain unchanged.
  • D
    Lime water will dissolve the carbon dioxide.
Answer
Correct option: B.
It will turn lime water milky and a white precipitate will form.
B
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MCQ 341 Mark
Which of the following is true about rusting of iron?
  • A
    It is a physical change because a new substance is not formed.
  • ✓
    It is a chemical change because iron reacts with oxygen to form rust.
  • C
    It is a physical change because iron does not lose its properties.
  • D
    It is a reversible process.
Answer
Correct option: B.
It is a chemical change because iron reacts with oxygen to form rust.
B
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MCQ 351 Mark
What is the significance of the "ignition temperature" in combustion?
  • A
    It is the temperature at which the fuel starts to burn without an external flame.
  • B
    It is the temperature at which combustion stops.
  • ✓
    It is the minimum temperature required to ignite a substance.
  • D
    It is the temperature when oxygen becomes flammable.
Answer
Correct option: C.
It is the minimum temperature required to ignite a substance.
C
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MCQ 361 Mark
In which of the following cases does the change involve both physical and chemical changes?
  • A
    Burning of magnesium ribbon
  • B
    Melting of ice
  • C
    Boiling of water
  • ✓
    Burning of a candle
Answer
Correct option: D.
Burning of a candle
D
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MCQ 371 Mark
Which of the following observations confirms that a chemical change has occurred?
  • A
    Change in shape
  • ✓
    Formation of a new substance
  • C
    Change in state
  • D
    Change in colour
Answer
Correct option: B.
Formation of a new substance
B
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MCQ (1 Marks) - Science STD 7 Questions - Vidyadip